<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			body{
				margin: 0;
				padding: 0;
			}
			.test_height{
				position: absolute;
				left: 0;
				right: 0;
				top: 0;
				bottom: 0;
				bottom:100px;
				background: #ccc;
			}
		</style>
	</head>
	<body>
		<div class="test_height">
			
		</div>
	</body>
</html>
